| --- | Log | opened Tue Feb 28 00:00:43 2006 |
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| 03:02 | <ygcheny> | Hi ! |
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| 03:13 | <teferi> | out of curiosity, are there actually any other OSes besides Linux that actually work with Xen3? |
| 03:15 | <ygcheny> | windows and some unix |
| 03:15 | <teferi> | well, the netbsd xen port is still only 2.0.7 |
| 03:15 | <teferi> | the freebsd one hasn't even been merged into -CURRENT yet |
| 03:15 | <teferi> | (and the last snapshot i tried didn't even boot to single-user mode) |
| 03:20 | <hensema> | are there any other oses beside linux nowadays? :-O |
| 03:21 | <ygcheny> | linux is the better OS to work with XEN now but there is some test with other OS |
| 03:23 | <ygcheny> | Net BSD ... |
| 03:23 | <teferi> | I just mentioned the netbsd port. |
| 03:23 | <teferi> | as I said, 3.0 only runs on 2.0.7, as does even the latest -CURRENT snapshot |
| 03:24 | <teferi> | (compiled mere hours ago) |
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| 05:57 | <muli> | good morning mdday |
| 05:57 | <mdday> | muli: good afternoon |
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| 06:54 | <hikenboot> | hello all---the build directions suggest make KERNELS=linux-2.6-xen world followed by make install ..it also suggests leaving off the KERNELS parameter if one wishes to build the domU and dom0 kernels...it then goes on to give directions for building the kernel if you want to do a custom config...my question is if I want to make world followed by making my own custom kernel (loading specific drivers into dom0 kernel as apposed |
| 06:55 | <hikenboot> | to the generic one) how would I do this? |
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| 06:57 | <hikenboot> | make linux-2.6-xen-config CONFIGMODE=menuconfig <----if i followed make world by this I would get only the generic kernel not the dom0/domU kernels to build ...yes/no? |
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| 07:09 | <ivan> | can i modify cpu_freq in shared_info/ |
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| 08:36 | <harry_> | is save restore on x86_64 supposed to work? i find that x86_32 works but x86_64 domu kernel crashes on restore. |
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| 08:58 | <iamlost> | aliguori: whats a clustering filesystem? |
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| 09:07 | <mancdaz> | if I start a system using "xm create -c <name>" so I can see the console messages as it boots up, how can I disconnet from that console in that session? |
| 09:14 | <ivan> | Ctrl-] |
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| 09:38 | <mancdaz> | ivan: thanks |
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| 10:06 | <iamlost> | wb gerrit |
| 10:06 | <iamlost> | aliguori: what is a cluster filesystem? |
| 10:06 | <aliguori> | iamlost, howdy |
| 10:07 | <aliguori> | iamlost, typically, it's a filesystem that shared between many nodes who's storage is distributed in some way (like afs, dfs, gpfs, etc) |
| 10:07 | <iamlost> | or nfs |
| 10:07 | <aliguori> | no |
| 10:07 | <iamlost> | ? |
| 10:07 | <aliguori> | nfs is not a cluster filesystem |
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| 10:07 | <aliguori> | b/c the data is stored on a server |
| 10:08 | <aliguori> | as opposed to shared across nodes |
| 10:08 | <iamlost> | oh |
| 10:08 | <iamlost> | so cluster is like peer to peer, vs nfs is like client-server |
| 10:08 | <iamlost> | ? |
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| 10:08 | <aliguori> | sort of, but it's not true p2p |
| 10:08 | <aliguori> | it really depends on the actual cluster filesystem |
| 10:09 | <iamlost> | so theres more thalike how? |
| 10:09 | <iamlost> | argh |
| 10:09 | [~] | iamlost kicks the wireless |
| 10:11 | <hensema> | google on redhat global filesystem |
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| 10:11 | <iamlost> | ok |
| 10:11 | [~] | iamlost kicks the wireless again |
| 10:12 | <iamlost> | someone needs to write a web-over -irc browser ;) |
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| 11:31 | <ivan> | call i modify the frequency that xen recieves a timer interrupt? |
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| 11:34 | <iamlost> | ivan: i hope so |
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| 12:56 | <iamlost> | ivan: i would find that extemely useful |
| 12:56 | <iamlost> | myself |
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| 13:48 | <ivan> | iamlost: you porting something to xen? |
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| 13:50 | <iamlost> | ivan: not really. |
| 13:50 | <Solist> | does anybody here knows about qemu disk emulation in vt-x? |
| 13:51 | <Solist> | My question is : does it use dma ? |
| 13:51 | <Solist> | I know that when using pcnet (AMD nic emulation) you use DMA |
| 13:51 | <Solist> | pcnet is the default ; but when using ne2000 |
| 13:51 | <iamlost> | qemu itself didnt support DMA until recently... |
| 13:51 | <Solist> | emulation you DON'T use DMA |
| 13:52 | <Solist> | ialmosy: but when using pcnet you DO use dma |
| 13:52 | <Solist> | ialmost: any idea what the situation is in this regard with block device? |
| 13:52 | <riel> | using DMA is especially important for emulation |
| 13:52 | [~] | iamlost isnt sure xen wise |
| 13:53 | <riel> | because then the emulator can just dump all the data at once, instead of doing one emulated IO cycle for every few bytes of data transferred ;) |
| 13:53 | <Solist> | riel, ialmost: so this is a good reason to use dma in block device |
| 13:54 | <riel> | inside VT guests |
| 13:54 | <riel> | paravirtualised guests don't have any issues like this of course |
| 13:54 | <Solist> | I am talking abouy vt-x |
| 13:55 | <Solist> | so the guest run in non-roop operation mode |
| 13:55 | <riel> | in fact, if you emulate DMA to the host and the guest is LVM or partition backed (no loop driver), then dom0 could tell the hardware to really DMA into the guest directly |
| 13:55 | <riel> | I don't know if this is done for VT guests, but it could be ;) |
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| 13:56 | <Solist> | Ok I will have to delve into the code ; hoped someome know about it... |
| 13:56 | <Solist> | because in pcnet it DOES use dma |
| 13:56 | <f> | the IDE emulation in qemu supports aio (which is like dma) afaik |
| 13:57 | <f> | not sure if it works in Xen ioemu yet though - it tends to be stuck at an old qemu release |
| 13:58 | <Solist> | what do you mean like dma ? as I understand dma enabled access to memory without provessor intervention |
| 13:58 | <Solist> | does aio means also without processor intervention ? |
| 13:58 | <Solist> | I am not sure at all |
| 14:00 | <f> | solist: processor does the copies, but it runs asynchronous |
| 14:00 | <f> | solist: ok except if it uses O_DIRECT, but i don't think ioemu does that |
| 14:02 | <Solist> | f: I thing this mode of synchronous operation is a different leve when comparing to dma |
| 14:03 | <Solist> | i meant , of course, "a different level" |
| 14:03 | <Solist> | i don't know of comparing aio to dma is right |
| 14:04 | <f> | solist: in this case it's right. it's all virtual, remember. |
| 14:05 | <Solist> | f : on a second thought there is something true in what you say |
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| 14:30 | <hikenboot> | I have compiled my xen kernel --its for use with iscsi as an initiator..it requires loading the nic driver into the kernel directly ..not as a module....I have compiled with this option but it the nic via_velocity simply doesnt load...anyone know what i am doing wrong? |
| 14:47 | <ns> | stupid question, but if you are compiling it into the kernel, what do you need loaded too? is the functionality not in the kernel? is the kernel not booting? |
| 14:48 | <hensema> | hikenboot: this is an domain0 kernel? |
| 14:48 | <hensema> | *a |
| 14:51 | <buggs> | aynone measured the performance of various switches and setups concerning > 4 GB memory in 32 Bit |
| 14:51 | <buggs> | ? |
| 14:51 | <buggs> | any hints ? |
| 15:06 | <hikenboot> | I understand it doesnt matter iscsi wont have a problem with order of loading ..besides iscsi appears to be too unstable for my usage right now |
| 15:07 | <hikenboot> | buggs i have never installed a PAE enabled xen kernel..but havent heard of any issues |
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| 15:13 | <f> | tom woller is the master of the cryptic short patch descriptions |
| 15:14 | <iamlost> | nah |
| 15:14 | <iamlost> | thats me |
| 15:14 | <iamlost> | ;) |
| 15:33 | <buggs> | does dom0 need to be configured for > 4GB though it only gets < 4GB ? |
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| 16:41 | <Shaun> | buggs: yes |
| 16:42 | <Shaun> | buggs: everything needs to be built with PAE support (hypervisor,dom0, and domU) |
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| 17:00 | <hikenboot_> | can anyone give the steps ..or put into a wiki the steps for setting up xen with a custom kernel..like adding drivers...I keep doing this and after screwing with it for a few hours get it working but never figure out exactly how! |
| 17:01 | <hikenboot_> | MAYBE somone should write a proper README file for the xen located in the mercurial database |
| 17:01 | <iamlost> | hikenboot: i use th xen-sparse tree that comes with 3.0.1 tho |
| 17:02 | <hikenboot_> | no problem i will use xen 3.0.1 for now since i am not using the iscsi which seems to lead into using it |
| 17:03 | <hikenboot_> | scarry thing is i always manage to get the damn thing working dancing around with make dist make world and all that stuff but have no understanding of what is actually happening |
| 17:04 | <hikenboot_> | i know that i have a custom config right now that works except has to be recompiled with NIC driver NOT loaded directly into the kernel |
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| 17:05 | <hikenboot_> | but damned if i can figure out what i did to compile it the first time with the dom0 specific kernel rather than the generic domo/domU kernel |
| 17:06 | <hikenboot_> | I thought I saved my directions as I went ..but cant find them either...ah...damn.... |
| 17:07 | <hikenboot_> | these are the newest directions ive found but they leave somthing to be desired....http://www.unix-tutorials.com/go.php?id=438 |
| 17:08 | <iamlost> | building using a custom config was painful |
| 17:11 | <tonfa> | iamlost: what i do is putting the ARCH=xen stuff in my oldconfig |
| 17:11 | <tonfa> | and then doing make ARCH=xen oldconfig |
| 17:13 | <hikenboot_> | so i should go into the directory lets say for instance linux-26.16-rc4-xen0 |
| 17:13 | <tonfa> | yes |
| 17:13 | <hikenboot_> | then do a nano .confiig ...put in ARCH=xen in there? |
| 17:13 | <tonfa> | no |
| 17:14 | <tonfa> | you copy the lines that talks about xen from xen0 defconfig into your customized config |
| 17:15 | <tonfa> | like CONFIG_XEN=y |
| 17:15 | <tonfa> | then you copy your customized config to .config and make ARCH=xen oldconfig |
| 17:15 | <tonfa> | it should results in a xen0 domain with the same drivers as your customized config |
| 17:17 | <hikenboot_> | ok so lets make this simple for a stupid moron like me....I goto the .config that is in the root of the mercurila.hg download of xen and copy from it the xen specific lines and copy them into my existing .config? |
| 17:17 | <tonfa> | yes |
| 17:17 | <hikenboot_> | I assume make ARCH=xen oldconfig would bring up menuconfig for further editing? |
| 17:17 | <tonfa> | no, it will ask some questions |
| 17:18 | <tonfa> | it tries to use the existing config as a valid one |
| 17:18 | <tonfa> | and asks question for new entries |
| 17:21 | <hikenboot_> | ok there is no .config in the root folder of xen just the .config that I created in the subdirectory called linux-2.6.16-rc4-xen0 |
| 17:22 | <hikenboot_> | which was built originally with xen which i edited some how..(dont remember how) |
| 17:22 | <hikenboot_> | what kills me is it was so damn easy for me to do I just dont remember they syntax i used |
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| 17:28 | <hikenboot_> | the directions say 1) make linux-2.6-xen-config CONFIGMODE=menuconfig 2)make linux-2.6-xen-build 3) make linux-2.6-xen-install 4) depmod 2.6.12.6-xen 5) mkinitrd -0 /boot/initrd-2.6.12.6-xen.img 2.6.12.6-xen...............however in my case I DONT want to build the root xen config that is generic and but rather wish to build the dom0/domU kernels specifically...but I dont understand how to do this! |
| 17:29 | <hikenboot_> | the problem is with line............make linux-2.6-xen-config which somehow finds a generic config probably from buildconfigs directory |
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| 17:30 | <hikenboot_> | I notice there is a mk.linux-2.6-xen file in the buildconfigs directory ..I wonder if i were to replace it with my config if it would pick up myconfig instead or would it error out |
| 17:32 | <hikenboot_> | nope that aint it |
| 17:35 | <aliguori> | qemu has supported dma for disks for quite some time (emulation at least). qemu recently got async io support (which is implemented with a thread--the underlying device is not opened with O_DIRECT though) |
| 17:35 | <aliguori> | xen got a different version of that patch that was written by some intel guys |
| 17:35 | <aliguori> | same basic idea though |
| 17:36 | <iamlost> | aliguori: different patch? |
| 17:36 | <aliguori> | yes |
| 17:36 | [~] | iamlost looks lost |
| 17:36 | <aliguori> | some intel guys wrote their own async io ptach |
| 17:36 | <iamlost> | was it xen only? |
| 17:36 | <aliguori> | specifically for xen |
| 17:36 | <aliguori> | yes |
| 17:36 | <iamlost> | oh |
| 17:36 | <iamlost> | ic |
| 17:37 | <hikenboot_> | aliguori: can you tell me what changes in the steps i listed above i should make to just edit a xen kernel configuration that I created for dom0? |
| 17:37 | <aliguori> | nope |
| 17:37 | <aliguori> | just use the default kernel |
| 17:37 | <aliguori> | i've not built a -xen kernel. |
| 17:37 | <aliguori> | i just use whatever make gives me |
| 17:38 | <hikenboot_> | I have to customize it...I am unfortuantly required to do it since i am building the kernel with computer spefic changes.. |
| 17:39 | <hikenboot_> | pisses me off cause i did it once about two days ago wrote my steps down and lost the damn sheet of paper |
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| 17:42 | <hikenboot_> | the way i swear i did it was to cd linux-2.6-16-rc4-xen0 then make ARCH=xen menuconfig |
| 17:43 | <hikenboot_> | but it gives me make*** No rule to make target |
| 17:43 | |-| | surriel changed nick to riel |
| 17:43 | <michal`> | and it is right :] |
| 17:43 | <michal`> | now xen is an subarch of x86 |
| 17:43 | <michal`> | so just make menuconfig |
| 17:45 | <hikenboot_> | YES....thank you thank you ...I knew it was somthing simple I did |
| 17:46 | [~] | michal` is xen newbie also ;] |
| 17:46 | <michal`> | just select xen somewhere in the menu |
| 17:46 | <michal`> | in kind of architecture |
| 17:47 | <hikenboot_> | I really need a course in compilers |
| 17:47 | <michal`> | btw |
| 17:47 | <hikenboot_> | seems like everyone does it differnetly... |
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| 17:48 | <michal`> | something what made my weekend with xen terrible - make sure you are using gcc 3 series (no 4) |
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| 17:53 | <hikenboot_> | ok so it would be make menuconfig CC=gcc-3.2 ? |
| 17:53 | <hikenboot_> | or does that come later |
| 17:55 | <tonyb> | hikenboot_: on all your make lines supply CC=gcc-3.2 HOSTCC=gcc-3.2 to be safe |
| 17:56 | <tonyb> | although aside from warnings I'm not haveing any problems with gcc-4* |
| 18:00 | <michal`> | it is told that tools are officialy not working with xen 3 and gcc 4 |
| 18:00 | <hikenboot_> | well i used that about six months ago on my config..problem is i have never changed from the instructions on the readme..this time it was necessary..the README leaves a little to be desired I will write somthing up and submit it to the users list or the dev list suggesting the method you guys have helped me with |
| 18:01 | <michal`> | here something tries to write into fd -1 ;p |
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| 18:08 | <hikenboot_> | the second line read make linux-2.6-xen-build.....I assume it should now read make CC=gcc-3.3 HOSTCC=gcc-3.3 ?????????yes and the third line make install CC=gcc-3.3 HOSTCC=gcc-3.3 ????? is that riight michal????? |
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| --- | Log | closed Wed Mar 01 00:00:34 2006 |